IR 05000260/1979011
| ML18024A847 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 05/30/1979 |
| From: | Dewease H TENNESSEE VALLEY AUTHORITY |
| To: | |
| References | |
| NUDOCS 7906140322 | |
| Download: ML18024A847 (1) | |
Text
~Q U.S.Nuclear ReELIlatary Commissioa Pegfon YX LOl ltartetta Street Atlanta~Georsia 30305'rzso-5O-260/79))
USNRC REG)'~"'<NTp,~9 tlAY 3Cl~7: 55 I~4S p p'KEILLY ,<UP>~e'CIIEgPEIll W g KEIOA I.LPIIP C E.lLURPH'f J.T.SUTHNLAtlP K.Il.CLNK P cup~~Pcurg H(a tkeported under TaDanieal Specifioetioa 6 7 2 g 4 Deke of Oecorrence-
?tay 25>1'~The of Occlinance
)928'bcmf NCt!haCcai specificatioa imehrtadt:
4 7'.e 4 ccmlttiens prior to Occurrence:
'5&a reactor<<a>>in tbe>>tartep mode+Pu11isg.rods for stnrtup foiieCVg a refue)ins cata'dentification and Descri tion of Occurrence:
Sable pui1ing rods to achieve.crCtiea'Lity, the first red 26 Z7~in Sroup 3 los iaadvertentXy eith-draen three notches~The rod moved froa'notch 02 ta 08 rather tbsp fxoa Q2 to (4 ae prescribed in the rod move sheets The reactor scz~e4 on.hi-hi ZW f1m.A reactfvCty insertion of approximately 0.287 percent de)ta K/K resulted when control rod 28-27 wse withdram frae 02 to 08~%be resuitieg reactor period by the S85 recorder@as about one second but vaa caxcEE)ated to ba approxfmatc)y 5 5 secoods-)tfler Ieiated Events: Based on era)uation of process neutron aonitoritC instrn" mentation, no safety XheCt mes<<xceeded.::orrtctXvt hetlun Taken ox planned Prior to restarta reefer of the event vs>>conducted!t was recoszCee%
that this rod waa a high4arth rod and therefore Mthdrava1.
~oa a notch basC>>The wkthdracta)
of the Xo4 front pasttion Qk to 08 is EInexp)awned Punctioaa)
testins of the rod after the event revea)ed that the rod would not travel three notches'nother related event.that occurred daxLng th>>togae of rod vithdravs)
waa thee l.xansfer of the 1ightieg panel.8omontari1y~
the Hshts dCIIlpled in the controi ream which cou)d have distracted the apexat,fag resulting fn the rod maviag thtee notches km interviepr vith the operator indicates this ws net the case Sb positive cause for the rod te trave1 the three notches hn>>been established, h subsequent rod pul), using the same rebuence~raeulted in.a period aC approximate)y 43 smconds rI G.Paaneesa~ower Plant SUperintendent
- teens Ferxy Nuclear Fiant ILILhOII,II IIjggi]j..>>.jr p V9O6X 4O3>~